JP5362391B2 - Chimney lining material removal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for efficiently removing a lining material such as asbestos or the like from an existing chimney, and to provide a method using it. <P>SOLUTION: As a rotary head 12, a preliminary head for removing the surface layer 2A of the lining material with bits attached so as to be storable inside the lining material 2 to be removed and a finishing head 12B attached with the bits 30 to further remove a lower layer 2B of the lining material after the removal of the surface layer are used. The finishing head is provided with a wire brush 40 for polishing the inner face of the chimney 1 after the removal of the lining material while the preliminary head and the finishing head can be selectively attached to the drive motor 13. After the removal of the surface layer 2A of the lining material in the preliminary work in the first place, the lower layer 2B of the lining material is further removed in the finishing work while the inner surface of the chimney is polished with the wire brush 40. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a chimney lining material removing device for removing a lining material such as asbestos that is attached to the inner surface of an existing chimney, and more particularly to a device that can be effectively applied to a small-diameter chimney.

As is well known, lining materials with fire resistance and heat insulation are applied inside the large chimneys of reinforced concrete, but asbestos (asbestos) is frequently used as the lining material in chimneys constructed in the past. It was.
In recent years, asbestos harmfulness has become clear, it is necessary to remove asbestos from the inner surface of the chimney to replace it with a safe lining material or to dismantle an existing chimney. For example, a removal apparatus as disclosed in Patent Document 1 has been developed as a means for safely and efficiently carrying out the process, and is now widely used.

8 to 9 show an outline of the removing apparatus shown in Patent Document 1. FIG. This is used by being suspended from the top of an existing chimney 1 and used to remove the lining material 2 such as asbestos attached to the inner surface of the chimney 1, and the device. The main body 10 is a holding device 20 for holding the main body 10 at the center position in the chimney 1.
The apparatus main body 10 is mounted with a rotary head 12 having a bit 11 for peeling and removing the lining material 2 on the peripheral edge, and a drive motor 13 for rotationally driving it. The holding device 20 is for holding the device main body 10 at the center position in the chimney 1 and for taking the reaction force of the rotational driving force of the driving motor 13. All three stages arranged radially can be deployed. An upper and lower two-stage arm group 21 composed of six arms 22 and a hydraulic cylinder 23 for opening and closing each of the arm groups 21 at each stage are provided.

As shown in FIG. 8B, the rotary head 12 in the apparatus main body 10 has a substantially cross shape in plan view, and the rotary shaft of the drive motor 13 is connected to the center of the rotary head 12 so that the cross section of the chimney 1 (usually a horizontal plane). ) And a bit mounting shaft 14 for mounting the bit 11 is provided at each tip portion extending in all directions.
For example, a circular bit 11A as shown in FIG. 9 (a) or a star-shaped bit 11B as shown in FIG. 9 (b) is preferably used as the bit 11, but both of them have an annular shape having a large-diameter mounting hole. In general, a plurality of (six in the illustrated example) bits 11 having slightly different diameters are overlapped as a set, and the bit mounting shaft 14 is inserted into the mounting holes, whereby the bits 11 Is mounted so as to be displaceable in the radial direction of the rotary head 12.

  According to the above conventional removal device, each bit 11 is naturally displaced radially outward by centrifugal force by rotating the rotary head 12 at a high speed by the drive motor 13, and in this state, the bit 11 moves along the inner surface of the chimney 1. The lining material 2 can be removed while circling, and the removal work of the lining material 2 over the entire inner surface of the chimney 1 can be efficiently performed by gradually raising or lowering the removal device in the chimney 1. And can be safely implemented.

JP-A-11-200160

  By the way, since the conventional removing device is configured to attach the bits 11 to the four outer peripheral edges of the cross-shaped rotary head 12, the external dimensions of the rotary head 12 must be considerably large. Therefore, all of these types of removal devices in practical use at the present time are intended for large chimneys with a chimney inner diameter of about 400 mmφ or more, and are difficult to apply to smaller chimneys. Depending on the diameter of the chimney, efficient removal may not always be possible, leaving room for improvement.

In view of the above circumstances, an object of the present invention is to provide a device for removing a lining material in a chimney for efficiently removing a lining material such as asbestos from an existing chimney, particularly a device that can be suitably applied to a small-diameter chimney. .

The chimney lining material removing apparatus of the present invention is arranged so as to be movable up and down in an existing chimney, and a rotary head provided with a bit is rotated along the cross section of the chimney by a drive motor, whereby the bit is subjected to centrifugal force. A lining material removal device in a chimney that is configured to displace the lining material attached to the inner surface of the chimney by removing the lining material in the radial direction, and can be accommodated inside the lining material to be removed as the rotating head. A spare head for removing the surface layer portion of the lining material with the attached bit and a finishing head equipped with a bit capable of removing the lower layer portion of the lining material after removing the surface layer portion with the spare head are used. The spare head and the finishing head can be selectively mounted on the drive motor, and the lining material is removed from the finishing head. Provided with a wire brush for polishing the chimney inner surface, with the outer diameter thereof bits are mounted a plurality of bits is superimposed on the pre-head is smaller ones lower their bit The lowermost bit can be stored inside the lining material to be removed, and the uppermost bit can remove the surface layer portion, and a plurality of bits are stacked on the finishing head. At the same time, the lowest bit among these bits can be stored inside the lower layer portion .

  According to the present invention, it is possible to apply to a small-diameter chimney by performing a two-stage removal operation by a preliminary operation and a finishing operation by making the rotary head replaceable with a preliminary head and a finishing head. In addition, a polishing operation with a wire brush can be performed simultaneously with the removing operation, and an extremely efficient operation as a whole is possible.

It is a figure which shows schematic structure of the removal apparatus which is one Embodiment of this invention. FIG. 6 is a diagram showing a situation at the time when preliminary work with a spare head is started. FIG. 4 is a diagram showing a spare head and a bit attached to the spare head. It is a figure which shows the condition in which the preliminary | backup operation | work by a spare head is implemented similarly. It is a figure which shows the condition at the time of replacing | exchanging to a finishing head and starting finishing work. It is a figure which shows a finishing head and the wire brush and bit with which it was mounted | worn with same. It is a figure which shows the condition which is implementing the finishing operation | work by a finishing head. It is a figure which shows an example of the conventional removal apparatus. It is a figure which shows the example of a bit similarly.

  Hereinafter, an embodiment of a chimney lining material removing apparatus according to the present invention will be described with reference to FIGS. 1 to 7. The basic configuration and basic functions of the removing apparatus of the present embodiment are shown in FIG. Therefore, elements common to the conventional removal apparatus are denoted by the same reference numerals, and description thereof is omitted.

  The removal apparatus of the present embodiment is mainly composed of the apparatus main body 10 and the holding apparatus 20 as in the conventional removal apparatus described above, and the apparatus main body 10 has a configuration in which the rotary head 12 can be attached to the drive motor 13. However, in the removing apparatus of this embodiment, the spare head 12A and the finishing head 12B can be alternatively mounted as the rotary head 12. First, the spare head 12A is mounted and the surface layer portion 2A of the lining material 2 is removed. The main work is to carry out a preliminary work for the purpose, and then to replace the finishing head 12B to further remove the lower layer 2B of the lining material 2 and to perform a finishing work for polishing the inner surface of the chimney 1.

  FIG. 1 shows a state in which the spare head 12A is mounted, and FIGS. 2 to 4 show details of the spare head 12A and the state of the preliminary work by that. 5 to 7 show the details of the finishing head 12B and the state of finishing work by it.

As shown in FIG. 3, three bit attachment shafts 14 are attached to the spare head 12A at equal intervals in the circumferential direction, and three bits 30 are attached to each bit attachment shaft 14 in an overlapping manner. It has become so.
Each of these bits 30 has a gear shape as shown in FIG. 3 (b), and has a mounting hole larger in diameter than the bit mounting shaft 14 as in the conventional bit 11 shown in FIG. The lining material 2 can be removed by being displaced outwardly by the centrifugal force generated by the rotation of the spare head 12A.

  As shown in FIG. 2 and FIG. 3B, the outer diameter of the three bits 30 is smaller as the lower one, and the smallest bit 30 at the lowermost stage is removed when it is displaced inward. It can be stored inside the power lining material 2. Further, the outer diameter dimension of the uppermost largest bit 30 is set to such an extent that the surface layer portion 2A of the lining material 2 is removed even when the outermost bit 30 is displaced outward. In other words, the spare head 12A only removes the surface layer portion 2A of the lining material 2 and does not intentionally remove the entire surface layer portion 2A.

  FIG. 3A shows an example of specific dimensions. For example, the inner diameter dimension of the lining material 2 to be removed is 170 mmφ, and the outer diameter dimension (that is, the inner diameter dimension of the chimney 1) is 270 mmφ. As an application example in the case where the thickness is 50 mm, the bit mounting shaft 14 in the spare head 12A is located at a position 57 mm from the center, and thereby the maximum removal dimension by the spare head 12A is 214 mmφ, thereby the surface layer portion 2A of the lining material 2 is formed. What is necessary is just to make it leave as it is, without removing by the thickness of 22mm, and removing the remaining 28mm as the lower layer part 2B.

Since only the surface layer portion 2A of the lining material 2 is removed by the spare head 12A in this way, the maximum removal dimension by the spare head 12A is made larger than the outer diameter dimension (270 mmφ in the illustrated example) of the lining material 2. This eliminates the need for a large-diameter bit 30, so that the spare head 12 </ b> A can be inserted into the chimney 1 without any trouble.
In other words, if the entire lining material 2 is to be removed by the spare head 12A, the maximum removal dimension by the spare head 12A must be larger than the outer diameter dimension (270 mmφ in the illustrated example) of the lining material 2, For this purpose, it is necessary to attach a bit 30 having a larger diameter. However, if the bit 30 having a larger diameter is attached, it may be difficult to insert the bit 30 into a small chimney, which is not preferable.
Therefore, if the spare head 12A dares to remove only the surface layer portion 2A of the lining material 2, the spare head 12A can be inserted into the chimney 1 without any trouble from the top of the chimney 1 as shown in FIG. The surface layer portion 2A of the lining material 2 can be efficiently removed by lowering the chimney 1 as it is as shown in FIG.

After performing the preliminary work by the spare head 12A as described above, the entire apparatus is pulled up and replaced with the finishing head 12B, and this time, the finishing work by the finishing head 12B is performed as shown in FIGS.
The finishing head 12B is basically one in which three bits 30 are mounted on the three bit mounting shafts 14 in the same manner as the spare head 12A, but the lower layer of the lining material 2 left without being removed in the preliminary work. The position of the bit mounting shaft 14 is set slightly outside in order to remove all the portion 2B, and the maximum removal dimension by the finishing head 12B is set larger than the maximum removal dimension by the spare head 12A.

As a specific example, the position of the bit mounting shaft 14 in the finishing head 12B is 75 mm from the center as shown in FIG. 6B, and the maximum removal dimension by the finishing head 12B is the outer diameter dimension of the lining material 2 ( In the illustrated example, it is set to 280 mmφ which is slightly larger than 270 mmφ), and is set so that all of the lower layer portion 2B of the lining material 2 left without being removed in the preliminary work can be removed.
Note that the lowermost bit 30 is inside the inner diameter dimension (214 mmφ in the illustrated example) of the lower layer portion 2B of the lining material 2 so that the finishing head 12B can be inserted into the lining material 2 without any trouble at the start of the finishing operation. It can be accommodated .

  Furthermore, as shown in FIG. 5 and FIG. 6A, wire brushes 40 are mounted at three positions at equal intervals on the top of the finishing head 12B so that the inner surface of the chimney 1 can be polished by the wire brushes 40. Has been.

  Therefore, the finished finishing head 12B as shown in FIG. 5 is inserted into the chimney 1 from the top, and the entire apparatus is lowered in the chimney 1 as shown in FIG. The lower layer 2B of the remaining lining material 2 can be efficiently removed by the finishing head 12B, and at the same time, the wire brush 40 can polish the inner surface of the chimney 1 with it.

  As described above, in the present invention, the rotary head 12 is composed of the spare head 12A and the finishing head 12B so that they can be exchanged, and the preliminary head 12A and the finishing head 12B perform two-stage removal work. By doing so, it can be applied to a small-diameter chimney, and at the same time as the removal work, a polishing work with the wire brush 40 is also possible, so that a very efficient work as a whole is possible. In other words, the removal device of the present invention and the removal method using the removal device use this technique to divide the lining material 2 into two stages, thereby obstructing the removal work by this type of device even for small-sized chimneys. It can be said that it has become possible to apply without any problems.

  As the holding device 20 in the removing apparatus of the present invention, a structure in which an upper and lower two-stage arm group 21 is opened and closed by two hydraulic cylinders 23 as in the conventional removing apparatus shown in FIG. However, as shown in FIG. 1, it is also possible to employ a holding device 20 having a configuration in which the upper and lower two-stage arm group 21 is collectively operated by one bi-directional cylinder 25 and two springs 26. Is preferred.

That is, as shown in FIG. 1, the holding device 20 in the removing device according to the present embodiment has springs 26 (pressing springs) arranged above the arm groups 21 of the respective stages, and the downward biasing force of the springs 26. By pushing down the upper end of each arm 22 through the pusher 27, each arm 22 is expanded outward. A bi-directional cylinder 25 is disposed between the springs 26, and the upper and lower ends of the rod 25a are engaged with the upper and lower pushers 27 by an upward operation of the rod 25a. By pushing upward against the urging force of the spring 26, the arms 22 are all pulled back inward.
According to the holding device 20 configured as described above, the entire device can be stably held by the upper and lower two-stage arm groups 21 as well as the arm groups 21 at each stage independently as in the prior art. There is no need to use two hydraulic cylinders 23, and the holding device 20 can be made compact, which is advantageous in reducing the diameter of the entire removal device.

  The embodiment of the present invention has been described above. However, the above embodiment is merely a preferred example, and the present invention is not limited to the above embodiment, and of course, after the surface layer portion of the lining material is removed by a spare head. As long as it does not deviate from the gist of the present invention by replacing the finishing head and further removing the lower layer portion of the lining material and polishing with a wire brush, the structure of the apparatus main body and the holding apparatus are appropriate, particularly the spare head and Appropriate design changes and applications are possible for the specific configuration of the finishing head, the specifications of the bits to be mounted on it, the number of bits and other detailed configurations, and the size and structure of the chimney to be removed are also particularly limited It is not a thing.

DESCRIPTION OF SYMBOLS 1 Chimney 2 Lining material 2A Surface layer part 2B Lower layer part 10 Apparatus main body 12 Rotating head 12A Spare head 12B Finishing head 13 Drive motor 14 Bit mounting shaft 20 Holding device 21 Arm group 22 Arm 25 Bidirectional cylinder 25a Rod 26 Spring 27 Pusher 30 Bit 40 Wire brush

Claims (1)

A rotary head with a bit that is arranged to be able to move up and down in an existing chimney is rotated along the cross section of the chimney by a drive motor, and the bit is displaced radially outward by centrifugal force and attached to the chimney inner surface A lining material removal device in a chimney configured to peel off and remove a lining material that has been
As the rotating head, a spare head for removing the surface layer portion of the lining material by a bit mounted so as to be accommodated inside the lining material to be removed, and a lining material after the surface layer portion is removed by the spare head A finishing head equipped with a bit capable of removing the lower layer portion is used, and the spare head and the finishing head can be selectively attached to the drive motor, and the finishing head has a lining material after being removed. A wire brush for polishing the chimney inner surface is provided,
A plurality of bits are stacked on the spare head, and the outer diameters of the bits are made smaller as the lower ones, and the lowermost bit of those bits is the lining material to be removed. It can be stored inside and the uppermost bit can remove the surface layer,
A chimney lining material characterized in that a plurality of bits are stacked and attached to the finishing head, and a lowermost bit among the bits is storable inside the lower layer portion. Removal device.

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